DmitryPolukhin created this revision. DmitryPolukhin added a reviewer: rnk. DmitryPolukhin added a subscriber: cfe-commits.
Clang doesn't dllexport defaulted special member function defaulted inside class but does it if they defaulted outside class. MSVC doesn't make any distinction where they were defaulted. Also MSVC 2013 and 2015 export different set of members. MSVC2015 doesn't emit trivial defaulted x-tors but does emit copy assign operator. http://reviews.llvm.org/D20422 Files: lib/Sema/SemaDeclCXX.cpp test/CodeGenCXX/dllexport-members.cpp test/CodeGenCXX/dllexport.cpp
Index: test/CodeGenCXX/dllexport.cpp =================================================================== --- test/CodeGenCXX/dllexport.cpp +++ test/CodeGenCXX/dllexport.cpp @@ -1,8 +1,8 @@ -// RUN: %clang_cc1 -triple i686-windows-msvc -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O1 -mconstructor-aliases -disable-llvm-optzns -o - %s -w -fms-compatibility-version=19.00 | FileCheck --check-prefix=MSC --check-prefix=M32 -check-prefix=MSVC2015 %s -// RUN: %clang_cc1 -triple i686-windows-msvc -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O1 -mconstructor-aliases -disable-llvm-optzns -o - %s -w -fms-compatibility-version=18.00 | FileCheck --check-prefix=MSC --check-prefix=M32 -check-prefix=MSVC2013 %s +// RUN: %clang_cc1 -triple i686-windows-msvc -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O1 -mconstructor-aliases -disable-llvm-optzns -o - %s -w -fms-compatibility-version=19.00 | FileCheck --check-prefix=MSC --check-prefix=M32 -check-prefix=MSVC2015 -check-prefix=M32MSVC2015 %s +// RUN: %clang_cc1 -triple i686-windows-msvc -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O1 -mconstructor-aliases -disable-llvm-optzns -o - %s -w -fms-compatibility-version=18.00 | FileCheck --check-prefix=MSC --check-prefix=M32 -check-prefix=MSVC2013 -check-prefix=M32MSVC2013 %s -// RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O0 -o - %s -w -fms-compatibility-version=19.00 | FileCheck --check-prefix=MSC --check-prefix=M64 -check-prefix=MSVC2015 %s -// RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O0 -o - %s -w -fms-compatibility-version=18.00 | FileCheck --check-prefix=MSC --check-prefix=M64 -check-prefix=MSVC2013 %s +// RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O0 -o - %s -w -fms-compatibility-version=19.00 | FileCheck --check-prefix=MSC --check-prefix=M64 -check-prefix=MSVC2015 -check-prefix=M64MSVC2015 %s +// RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O0 -o - %s -w -fms-compatibility-version=18.00 | FileCheck --check-prefix=MSC --check-prefix=M64 -check-prefix=MSVC2013 -check-prefix=M64MSVC2013 %s // RUN: %clang_cc1 -triple i686-windows-gnu -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O0 -o - %s -w | FileCheck --check-prefix=GNU --check-prefix=G32 %s // RUN: %clang_cc1 -triple x86_64-windows-gnu -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O0 -o - %s -w | FileCheck --check-prefix=GNU --check-prefix=G64 %s @@ -561,7 +561,7 @@ // Explicitly defaulted copy constructur: T(const T&) = default; - // M32-DAG: define weak_odr dllexport x86_thiscallcc %struct.T* @"\01??0T@@QAE@ABU0@@Z" + // M32MSVC2013-DAG: define weak_odr dllexport x86_thiscallcc %struct.T* @"\01??0T@@QAE@ABU0@@Z" void a() {} // M32-DAG: define weak_odr dllexport x86_thiscallcc void @"\01?a@T@@QAEXXZ" @@ -647,9 +647,34 @@ struct __declspec(dllexport) DefaultedCtorsDtors { DefaultedCtorsDtors() = default; - // M32-DAG: define weak_odr dllexport x86_thiscallcc %struct.DefaultedCtorsDtors* @"\01??0DefaultedCtorsDtors@@QAE@XZ" + // M32MSVC2013-DAG: define weak_odr dllexport x86_thiscallcc %struct.DefaultedCtorsDtors* @"\01??0DefaultedCtorsDtors@@QAE@XZ" ~DefaultedCtorsDtors() = default; - // M32-DAG: define weak_odr dllexport x86_thiscallcc void @"\01??1DefaultedCtorsDtors@@QAE@XZ" + // M32MSVC2013-DAG: define weak_odr dllexport x86_thiscallcc void @"\01??1DefaultedCtorsDtors@@QAE@XZ" +}; + +// Export defaulted member function definitions declared inside class. +struct __declspec(dllexport) ExportDefaultedInclassDefs { + ExportDefaultedInclassDefs() = default; + // M32VS2013-DAG: define weak_odr dllexport x86_thiscallcc %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QAE@XZ"(%struct.ExportDefaultedInclassDefs* returned %this) + // M64VS2013-DAG: define weak_odr dllexport %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QEAA@XZ"(%struct.ExportDefaultedInclassDefs* returned %this) + // M32VS2015-NOT: define weak_odr dllexport x86_thiscallcc %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QAE@XZ"(%struct.ExportDefaultedInclassDefs* returned %this) + // M64VS2015-NOT: define weak_odr dllexport %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QEAA@XZ"(%struct.ExportDefaultedInclassDefs* returned %this) + + ~ExportDefaultedInclassDefs() = default; + // M32VS2013-DAG: define weak_odr dllexport x86_thiscallcc void @"\01??1ExportDefaultedInclassDefs@@QAE@XZ"(%struct.ExportDefaultedInclassDefs* %this) + // M64VS2013-DAG: define weak_odr dllexport void @"\01??1ExportDefaultedInclassDefs@@QEAA@XZ"(%struct.ExportDefaultedInclassDefs* %this) + // M32VS2015-NOT: define weak_odr dllexport x86_thiscallcc void @"\01??1ExportDefaultedInclassDefs@@QAE@XZ"(%struct.ExportDefaultedInclassDefs* %this) + // M64VS2015-NOT: define weak_odr dllexport void @"\01??1ExportDefaultedInclassDefs@@QEAA@XZ"(%struct.ExportDefaultedInclassDefs* %this) + + ExportDefaultedInclassDefs(const ExportDefaultedInclassDefs&) = default; + // M32VS2013-DAG: define weak_odr dllexport x86_thiscallcc %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QAE@ABU0@@Z"(%struct.ExportDefaultedInclassDefs* returned %this, %struct.ExportDefaultedInclassDefs* dereferenceable({{[0-9]+}})) + // M64VS2013-DAG: define weak_odr dllexport %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QEAA@AEBU0@@Z"(%struct.ExportDefaultedInclassDefs* returned %this, %struct.ExportDefaultedInclassDefs* dereferenceable({{[0-9]+}})) + // M32VS2015-NOT: define weak_odr dllexport x86_thiscallcc %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QAE@ABU0@@Z"(%struct.ExportDefaultedInclassDefs* returned %this, %struct.ExportDefaultedInclassDefs* dereferenceable({{[0-9]+}})) + // M64VS2015-NOT: define weak_odr dllexport %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QEAA@AEBU0@@Z"(%struct.ExportDefaultedInclassDefs* returned %this, %struct.ExportDefaultedInclassDefs* dereferenceable({{[0-9]+}})) + + ExportDefaultedInclassDefs& operator=(const ExportDefaultedInclassDefs&) = default; + // M32-DAG: define weak_odr dllexport x86_thiscallcc dereferenceable({{[0-9]+}}) %struct.ExportDefaultedInclassDefs* @"\01??4ExportDefaultedInclassDefs@@QAEAAU0@ABU0@@Z"(%struct.ExportDefaultedInclassDefs* %this, %struct.ExportDefaultedInclassDefs* dereferenceable({{[0-9]+}})) + // M64-DAG: define weak_odr dllexport dereferenceable({{[0-9]+}}) %struct.ExportDefaultedInclassDefs* @"\01??4ExportDefaultedInclassDefs@@QEAAAEAU0@AEBU0@@Z"(%struct.ExportDefaultedInclassDefs* %this, %struct.ExportDefaultedInclassDefs* dereferenceable({{[0-9]+}})) }; namespace ReferencedInlineMethodInNestedClass { @@ -721,7 +746,7 @@ // M32-DAG: define weak_odr dllexport x86_thiscallcc %struct.ExplicitInstConstexprMembers* @"\01??0?$ExplicitInstConstexprMembers@X@@QAE@XZ" ExplicitInstConstexprMembers(const ExplicitInstConstexprMembers&) = default; - // M32-DAG: define weak_odr dllexport x86_thiscallcc %struct.ExplicitInstConstexprMembers* @"\01??0?$ExplicitInstConstexprMembers@X@@QAE@ABU0@@Z" + // M32MSVC2013-DAG: define weak_odr dllexport x86_thiscallcc %struct.ExplicitInstConstexprMembers* @"\01??0?$ExplicitInstConstexprMembers@X@@QAE@ABU0@@Z" constexpr int f() const { return 42; } // M32-DAG: define weak_odr dllexport x86_thiscallcc i32 @"\01?f@?$ExplicitInstConstexprMembers@X@@QBEHXZ" Index: test/CodeGenCXX/dllexport-members.cpp =================================================================== --- test/CodeGenCXX/dllexport-members.cpp +++ test/CodeGenCXX/dllexport-members.cpp @@ -1,5 +1,7 @@ -// RUN: %clang_cc1 -triple i686-windows-msvc -fms-compatibility -emit-llvm -std=c++1y -O0 -o - %s | FileCheck --check-prefix=MSC --check-prefix=M32 %s -// RUN: %clang_cc1 -triple x86_64-windows-msvc -fms-compatibility -emit-llvm -std=c++1y -O0 -o - %s | FileCheck --check-prefix=MSC --check-prefix=M64 %s +// RUN: %clang_cc1 -triple i686-windows-msvc -fms-compatibility -fms-compatibility-version=18 -emit-llvm -std=c++1y -O0 -o - %s | FileCheck --check-prefix=MSC --check-prefix=M32 %s +// RUN: %clang_cc1 -triple x86_64-windows-msvc -fms-compatibility -fms-compatibility-version=18 -emit-llvm -std=c++1y -O0 -o - %s | FileCheck --check-prefix=MSC --check-prefix=M64 %s +// RUN: %clang_cc1 -triple i686-windows-msvc -fms-compatibility -fms-compatibility-version=19 -emit-llvm -std=c++1y -O0 -o - %s | FileCheck --check-prefix=M32VS2015 %s +// RUN: %clang_cc1 -triple x86_64-windows-msvc -fms-compatibility -fms-compatibility-version=19 -emit-llvm -std=c++1y -O0 -o - %s | FileCheck --check-prefix=M64VS2015 %s // RUN: %clang_cc1 -triple i686-windows-gnu -emit-llvm -std=c++1y -O0 -o - %s | FileCheck --check-prefix=GNU --check-prefix=G32 %s // RUN: %clang_cc1 -triple x86_64-windows-gnu -emit-llvm -std=c++1y -O0 -o - %s | FileCheck --check-prefix=GNU --check-prefix=G64 %s @@ -427,6 +429,32 @@ ExportDefaultedDefs& ExportDefaultedDefs::operator=(ExportDefaultedDefs&&) = default; +// Export defaulted member function definitions declared inside class. +struct ExportDefaultedInclassDefs { + __declspec(dllexport) ExportDefaultedInclassDefs() = default; + // M32VS2013-DAG: define weak_odr dllexport x86_thiscallcc %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QAE@XZ"(%struct.ExportDefaultedInclassDefs* returned %this) + // M64VS2013-DAG: define weak_odr dllexport %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QEAA@XZ"(%struct.ExportDefaultedInclassDefs* returned %this) + // M32VS2015-NOT: define weak_odr dllexport x86_thiscallcc %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QAE@XZ"(%struct.ExportDefaultedInclassDefs* returned %this) + // M64VS2015-NOT: define weak_odr dllexport %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QEAA@XZ"(%struct.ExportDefaultedInclassDefs* returned %this) + + __declspec(dllexport) ~ExportDefaultedInclassDefs() = default; + // M32VS2013-DAG: define weak_odr dllexport x86_thiscallcc void @"\01??1ExportDefaultedInclassDefs@@QAE@XZ"(%struct.ExportDefaultedInclassDefs* %this) + // M64VS2013-DAG: define weak_odr dllexport void @"\01??1ExportDefaultedInclassDefs@@QEAA@XZ"(%struct.ExportDefaultedInclassDefs* %this) + // M32VS2015-NOT: define weak_odr dllexport x86_thiscallcc void @"\01??1ExportDefaultedInclassDefs@@QAE@XZ"(%struct.ExportDefaultedInclassDefs* %this) + // M64VS2015-NOT: define weak_odr dllexport void @"\01??1ExportDefaultedInclassDefs@@QEAA@XZ"(%struct.ExportDefaultedInclassDefs* %this) + + __declspec(dllexport) ExportDefaultedInclassDefs(const ExportDefaultedInclassDefs&) = default; + // M32VS2013-DAG: define weak_odr dllexport x86_thiscallcc %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QAE@ABU0@@Z"(%struct.ExportDefaultedInclassDefs* returned %this, %struct.ExportDefaultedInclassDefs* dereferenceable({{[0-9]+}})) + // M64VS2013-DAG: define weak_odr dllexport %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QEAA@AEBU0@@Z"(%struct.ExportDefaultedInclassDefs* returned %this, %struct.ExportDefaultedInclassDefs* dereferenceable({{[0-9]+}})) + // M32VS2015-NOT: define weak_odr dllexport x86_thiscallcc %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QAE@ABU0@@Z"(%struct.ExportDefaultedInclassDefs* returned %this, %struct.ExportDefaultedInclassDefs* dereferenceable({{[0-9]+}})) + // M64VS2015-NOT: define weak_odr dllexport %struct.ExportDefaultedInclassDefs* @"\01??0ExportDefaultedInclassDefs@@QEAA@AEBU0@@Z"(%struct.ExportDefaultedInclassDefs* returned %this, %struct.ExportDefaultedInclassDefs* dereferenceable({{[0-9]+}})) + + __declspec(dllexport) ExportDefaultedInclassDefs& operator=(const ExportDefaultedInclassDefs&) = default; + // M32-DAG: define weak_odr dllexport x86_thiscallcc dereferenceable({{[0-9]+}}) %struct.ExportDefaultedInclassDefs* @"\01??4ExportDefaultedInclassDefs@@QAEAAU0@ABU0@@Z"(%struct.ExportDefaultedInclassDefs* %this, %struct.ExportDefaultedInclassDefs* dereferenceable({{[0-9]+}})) + // M64-DAG: define weak_odr dllexport dereferenceable({{[0-9]+}}) %struct.ExportDefaultedInclassDefs* @"\01??4ExportDefaultedInclassDefs@@QEAAAEAU0@AEBU0@@Z"(%struct.ExportDefaultedInclassDefs* %this, %struct.ExportDefaultedInclassDefs* dereferenceable({{[0-9]+}})) +}; + + // Export allocation functions. struct ExportAlloc { __declspec(dllexport) void* operator new(__SIZE_TYPE__); Index: lib/Sema/SemaDeclCXX.cpp =================================================================== --- lib/Sema/SemaDeclCXX.cpp +++ lib/Sema/SemaDeclCXX.cpp @@ -4816,6 +4816,12 @@ (CXXC && CXXC->isMoveConstructor())) && !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015)) continue; + + // MSVC2015 doesn't export trivial defaulted x-tor but copy assign + // operator is exported anyway. + if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) && + (CXXC || isa<CXXDestructorDecl>(MD)) && MD->isTrivial()) + continue; } } @@ -13057,28 +13063,42 @@ // If the method was defaulted on its first declaration, we will have // already performed the checking in CheckCompletedCXXClass. Such a - // declaration doesn't trigger an implicit definition. - if (Primary == Primary->getCanonicalDecl()) + // declaration doesn't trigger an implicit definition. But defaulted methods + // marked with dllexport do need implicit definition. + bool InClassDef = Primary == Primary->getCanonicalDecl(); + bool HasDllexport = MD->hasAttr<DLLExportAttr>(); + if (InClassDef && !HasDllexport) return; - CheckExplicitlyDefaultedSpecialMember(MD); + if (!InClassDef) + CheckExplicitlyDefaultedSpecialMember(MD); if (MD->isInvalidDecl()) return; + auto PostAction = [=]{ + if (InClassDef && + (Member == CXXCopyAssignment || + !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015))) + ActOnFinishInlineFunctionDef(MD); + }; switch (Member) { case CXXDefaultConstructor: DefineImplicitDefaultConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); + PostAction(); break; case CXXCopyConstructor: DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); + PostAction(); break; case CXXCopyAssignment: DefineImplicitCopyAssignment(DefaultLoc, MD); + PostAction(); break; case CXXDestructor: DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD)); + PostAction(); break; case CXXMoveConstructor: DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD));
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